<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
             xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div th:fragment="myHeader">我是头1111111</div>
</body>
</html>